What phono preamps are balanced

I am running the GCPH balanced out to either a GCC-100 or atma-sphere MA1.

I find the GCPH doesnt have enough gain for me with a .5mv cart. It sounds quite good though.

I had a Tron Seven in for comparison - that sounded a bit more real and 3d - and had more gain- but that was single ended.

Ayre P-5XE

Are you concerned with balanced input from your cartridge or just balanced output? I would be surprised if many mentioned offer balanced input. However, FM Acoustics, Atma-sphere, and Boulder come to mind, and there must be others.

Clearaudio Balanced Reference Phono (Dual mono) stage has both balanced inuputs and outputs

Just thought you might be interested in some history:

We introduced the first balanced phono preamp in 1989- the MP-1. It is also fully differential and was the first all tube preamp that was fully differential from input to output. The EQ is handled in differential mode to prevent tube aging from affecting EQ. Although the unit has a line stage it was built with the intention as a stand-alone phono reproducer.

We devised the system of using XLRs with phono cartridges, eliminating the separate grounding wire.

One thing that the high end audio industry does not seem to get is that the balanced line system was created to eliminate interconnect cable problems. Balanced lines allow both long cable lengths without degradation and inexpensive cables to be used, also without degradation. This advantage is not available to single-ended cables. Not all balanced line preamps in high end audio support the balanced line standard, but if they do the difference between a really expensive cable and a really cheap one will be very little. Effectively the hidden cost of the interconnect is removed from the cost of the preamp/volume control system.